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Seminars

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  • Title:Entanglement of Condensed Magnons via Momentum-space Fragmentation
  • Start Date/Time:2017-02-14 / 13:30
  • End Date/Time :2017-02-14 / 15:00
    • Speaker:Dr. Clement Wong (Postdoctoral research associate at the laboratory for physical sciences-University of Maryland, College Park)
    • Place:Lecture Room A of NCTS, 4F, 3rd General Building, Nat'l Tsing Hua Univ.
    • Host:Prof. Chung-Yu Mou
    • Decorative image
      Abstract: Motivated by recent interest in quantum control of magnons in magnetic
      insulators, we propose a scheme for engineering momentum-space entanglement
      of fragmented magnon condensates. We consider easy plane frustrated
      antiferromagnets where magnon dispersions have degenerate minima that
      represent ``umbrella" chiral spin textures. We show that with an applied
      sinusoidal magnetic field, the ground state can be tuned near a quantum
      critical point that exhibits macroscopic quantum coherence. The size of the
      macroscopic superposition as determined by the Fisher quantum information is
      shown to be measureable through the magnetic structure factor obtained by
      neutron scattering. We also show that the quantum phase transition is
      signaled by a singularity in the momentum-space entanglement entropy. Our
      model is representative of equilibrium magnon condensates in frustrated
      antiferromagnets such as CsCuCl_3, and can also be simulated in spin-orbit
      coupled Mott insulators in atomic optical lattices and circuit quantum
      electrodynamics.
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